The operating vapor velocity is specified to minimize the entrainment of liquid drops in the exiting vapor.
The Souders-Brown equation was derived from a force balance on a droplet suspended in a gas flowing upwards. It was originally derived to size fractionating columns.
- ρL is the liquid density (kg m-3)
- ρL is the gas density (kg m-3)
- K is the vapor or gas load factor (m s-1)
- V is the maximum allowable vapor velocity (m s-1)
K has a value of 0.107 m s-1 for a separator with a mesh pad. However, the right value of K is largely dependent on the operating conditions and physical properties of the system. The GPSA Engineering Data Handbook tabulates values of K for various operating conditions.
Once you have the maximum allowable vapor velocity, you can then calculate the drum diameter by dividing the vapor flowrate by the allowable vapor velocity.
Once you have the maximum allowable vapor velocity, you can then calculate the drum diameter by dividing the vapor flowrate by the allowable vapor velocity.
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